CN201396761Y - The burner with double rows of gas and air nozzles in the pre-combustion chamber and the external premixed combustion - Google Patents

Abstract

The utility model relates to a burner with double-row staggered arrangement of gas and air nozzles in the pre-combustion chamber for external pre-mixed combustion, which effectively solves the problems of unstable flow field of the combustion nozzle, uneven distribution of combustion air flow, poor nozzle adjustment function and the like caused by the expansion of the furnace type. , the structure is that there are air distribution rings and gas distribution rings in the wall of the burner body, there are two upper and lower air inlet pipes, the gas inlet pipe is placed between the upper and lower air inlet pipes, and the air distribution ring The air intake end of the gas distribution ring is connected with the air inlet pipe through the air channel, and the gas inlet end of the gas distribution ring is connected with the gas inlet pipe through the gas channel. The gas diversion nozzles and air diversion nozzles are arranged in a staggered manner. The gas diversion nozzles are connected to the gas channels through the gas diversion nozzle pipes, and the air diversion nozzles are connected to the air passages through the air diversion nozzle pipes. , high efficiency and long life.

Description

The burner with double rows of gas and air nozzles in the pre-combustion chamber and the external premixed combustion

1. Technical field

The utility model relates to a burner with double rows of gas and air nozzles in a pre-combustion chamber interlacedly arranged and externally premixed combustion applied to a hot blast stove of a blast furnace.

2. Background technology

Ceramic burners have been used in hot blast stoves for a long time. However, all kinds of ceramic burners currently have the following conditions:

(1) The nozzle arrangement of gas and combustion-supporting air is unreasonable, and the rapid and sufficient mixing of the two airflows cannot be achieved, thereby reducing the combustion intensity and causing unburned CO to be contained in the exhaust gas; otherwise, it is necessary to use The large excess air volume coefficient causes the theoretical combustion temperature to drop, and the temperature of the hot air cannot go up;

(2) The airflow entering the regenerator from the burner cannot achieve double uniformity in temperature and velocity distribution, resulting in a decrease in the utilization rate of the regenerator and poor heat transfer and heat storage effects, resulting in a decrease in the thermal efficiency of the hot blast stove, and a large number of high temperatures Emissions of gases to the environment;

(3) The uneven setting of the outlet airflow of the burner will lead to the pulsation of the airflow in the combustion chamber, which will cause "vibration" in the connected piping system and the combustion chamber under high load, especially in the hot blast stove with the fire well combustion chamber , combustion "vibration" problems are common.

An existing burner (application number 200510018053.7) overcomes the above-mentioned problems, but there are still places to be improved in structure, especially the burner is a single-row arrangement of burner nozzles. It is difficult to arrange a single row of burner nozzles in the chamber. If the injection velocity is too large, it will cause adverse changes in the overall flow field structure; due to the single row of burner nozzles, the uniformity of the airflow in the preheating chamber and the rapidity of the airflow The mixing characteristics, as well as the adjustment function of the nozzle, are affected. Obviously, transforming its structure is an important technical problem that must be solved.

3. Contents of utility model

In view of the above situation and the actual needs of the hot blast stove burner, the utility model provides a burner with double rows of gas and air nozzles in the pre-combustion chamber, which are arranged in a staggered manner and are premixed, which can effectively solve the combustion problem caused by the expansion of the furnace type. The nozzle flow field is unstable, the combustion airflow is unevenly distributed, and the nozzle adjustment function is poor. The technical scheme of this utility model is, comprises burner body, air inlet pipe and gas inlet pipe, and air inlet pipe and gas inlet pipe are placed on the outer wall of burner body, and there is air distribution loop in the wall of burner body (namely Combustion-supporting air nozzle airflow distribution loop), gas distribution loop (that is, combustion-supporting gas nozzle airflow distribution loop), the air inlet pipe has two upper and lower, and the gas inlet pipe is placed between the upper and lower air inlet pipes, The air intake end of the air distribution ring is connected to the air inlet pipe through the air channel, and the gas inlet end of the gas distribution ring is connected to the gas inlet pipe through the gas channel. , The lower two rows of gas diversion nozzles and air diversion nozzles are arranged in a staggered manner. The gas diversion nozzles are connected to the gas channel through the gas diversion nozzle pipes, and the air diversion nozzles are connected to the air passage through the air diversion nozzle pipes. The novel structure of the utility model can The gas is quickly and evenly mixed to produce high-speed and high-efficiency combustion. The low-swirl flow keeps the airflow stable and distributes it evenly. Since the combustion process is carried out successively in the pre-combustion chamber and the combustion chamber, there is no large temperature difference between the two . In short, the staggered arrangement of the burners has fast mixing, high-speed combustion without pollution, high uniform air flow efficiency, stable structure and long service life, and its development and application has broad market prospects.

4. Description of drawings

Fig. 1 is the structural section front view of the utility model.

Fig. 2 is a sectional view of Fig. 1 of the present utility model.

Fig. 3 is a structural sectional front view of another embodiment of the present invention.

FIG. 4 is a cross-sectional view of the embodiment of FIG. 3 .

5. Specific implementation

Below in conjunction with accompanying drawing, the specific embodiment of the present utility model is described in detail.

As shown in Figure 1, the utility model includes a burner body, an air inlet pipe and a gas inlet pipe, the air inlet pipe and the gas inlet pipe are placed on the outer wall of the burner body, and there is an air distribution loop in the wall 7 of the burner body 2. The gas distribution ring 6, the air inlet pipe 1 has two upper and lower ones, the gas inlet pipe 5 is placed between the upper and lower air inlet pipes, the air inlet end of the air distribution ring 2 is connected to the air inlet through the air channel 3 The pipes 1 are connected, the gas inlet end of the gas distribution ring 6 is connected with the gas inlet pipe 5 through the gas channel 4, and there are upper and lower rows of staggered gas distribution nozzles 8 on the inner wall of the burner body. And air diversion nozzle 9, gas diversion nozzle 8 is communicated with gas channel 4 through gas diversion nozzle pipe, and air diversion nozzle 9 is communicated with air passage 3 through air diversion nozzle pipe.

In order to ensure the use effect, the air distribution ring 2 in the wall 7 of the burner body is an upper and lower ring arrangement, and the gas distribution ring 6 is a ring arrangement; the gas distribution ring 6 is arranged in parallel In the wall between the upper and lower air distribution rings 2; the upper row of air distribution nozzles through the upper air distribution nozzle pipe, the upper air channel is connected with the upper air distribution ring, the lower row of air distribution nozzles through the lower The air distribution nozzle pipe and the lower air channel are connected with the lower air distribution ring; the gas distribution nozzles in the upper row and the gas distribution nozzles in the lower row pass through the upper gas distribution nozzle pipe and the upper gas channel, the lower gas distribution nozzle pipe and the lower gas distribution nozzle respectively. The channel is connected with the gas distribution ring; the upper row of gas distribution nozzles and the upper row of air distribution nozzles are interlacedly distributed on the inner wall of the combustion chamber, the central plane of which is on the same horizontal plane, the lower row of gas distribution nozzles and the lower row of air distribution nozzles The nozzles are staggeredly distributed on the inner wall of the combustion chamber, and their central planes are also on the same horizontal plane; the central axes of the gas distribution nozzles and the air distribution nozzles have a certain inclination angle with the radial direction of the combustion chamber, and the gas distribution nozzles are the best. and the air splitting nozzles are staggered toward the combustion chamber at radial inclination angles ranging from 0 to 45°.

It should be pointed out that the structure of the embodiment shown in Fig. 3 and Fig. 4 is not substantially different from the structure shown in Fig. 1 and Fig. 2 as a whole, and the difference is only that the upper and lower air inlet pipes After the burner wall is directly connected by an air passage, it is connected with the upper and lower rows of air diversion nozzles on the inner wall of the combustion chamber through the air diversion nozzle pipe and the air passage. The novel overall structural forms all belong to the protection scope of the present utility model.

The utility model has a novel and unique structure, uniform gas mixing, fast speed, high combustion stability, long service life, complete combustion without environmental pollution, and has the following remarkable characteristics compared with the existing burner:

1. Combustion is uniform. Due to the use of double-row nozzles, the mixing process is accelerated, which makes the combustion process more uniform while dispersing the combustion intensity, and is also conducive to improving the stress state of the pre-combustion chamber structure;

2. Enhance the stability of structure and performance. After adopting double-row nozzles, the jet stream will reduce the impact on the pre-combustion chamber, especially in large-scale hot stoves, which can effectively avoid the selection of excessively large nozzles and excessively large injection speeds; The reduction of the jet stream in the combustion chamber will improve the uniformity of the flow field and avoid irregular pulsation; thus ensuring the stability of the air flow field and the structure of the combustion chamber;

3. The swirl intensity is reduced. After adopting double-row nozzles, under the condition that the combustion intensity is effectively dispersed and the airflow stability is increased, the radial deflection angle of the airflow can be appropriately reduced to weaken the swirl intensity, thereby improving the axial direction. Airflow uniformity;

4. Enhance the adjustment function of the nozzle. Due to the existence of two rows of staggered external mixing nozzles, the nozzle structure, deflection angle, injection speed, flow distribution and other factors are significantly increased compared with the single row nozzle, and its adjustable performance is also improved. Looking for a more reasonable nozzle structure and overall performance.

Claims (3)

1. A burner with double-row staggered arrangement of gas and air nozzles in the pre-combustion chamber for external premixed combustion, including a burner body, an air inlet pipe and a gas inlet pipe, and the air inlet pipe and the gas inlet pipe are placed on the outer wall of the burner body , which is characterized in that there are air distribution rings (2) and gas distribution rings (6) in the wall (7) of the burner body, there are two air inlet pipes (1) up and down, and the gas inlet pipe (5) is placed Between the upper and lower air inlet pipes, the inlet end of the air distribution ring (2) is connected with the air inlet pipe (1) through the air channel (3), and the inlet end of the gas distribution ring (6) The gas channel (4) is connected with the gas inlet pipe (5), and the upper and lower rows of gas diversion nozzles (8) and air diversion nozzles (9) are arranged in a circle on the inner wall of the burner body. The gas diversion nozzle (8) is communicated with the gas passage (4) through the gas diversion nozzle pipe, and the air diversion nozzle (9) is communicated with the air passage (3) through the air diversion nozzle pipe. 2. According to claim 1, the gas and air nozzles in the pre-combustion chamber are double-row staggered and externally premixed combustion burner, characterized in that the air distribution ring in the wall (7) of the burner body (2) The upper and lower two are arranged in a ring, the gas distribution ring (6) is a ring distribution, and the gas distribution ring (6) is placed in parallel between the upper and lower air distribution rings (2) In the wall, the upper row of air distribution nozzles is connected with the upper air distribution ring through the upper air distribution nozzle pipe and the upper air passage, and the lower row of air distribution nozzles is connected with the lower air distribution ring through the lower air distribution nozzle pipe and the lower air passage. The gas distribution nozzles in the upper row and the gas distribution nozzles in the lower row are respectively connected with the gas distribution ring through the upper gas distribution nozzle pipe and the upper gas channel, the lower gas distribution nozzle pipe and the lower gas channel. The split nozzles and the upper row of air split nozzles are interlacedly distributed on the inner wall of the combustion chamber, and their central planes are on the same horizontal plane; on the same level. 3. According to claim 1, the gas and air nozzles in the pre-combustion chamber are double-row staggered and externally premixed combustion burners, characterized in that the gas diversion nozzles and the air diversion nozzles are all in the range of 0-45° The radial inclination angles are staggered toward the combustion chamber.

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